297  
CDUS41 KLWX 040534  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
134 AM EDT TUE MAY 04 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 3 2021
 
 
CLIMATE NORMAL PERIOD: 1981 TO 2010  
CLIMATE RECORD PERIOD: 1960 TO 2021  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 74 6:25 PM 92 1965 72 2 79  
MINIMUM 61 4:38 AM 32 1963 47 14 58  
2005  
AVERAGE 68 60 8 69  
 
PRECIPITATION (IN)  
YESTERDAY 0.08 1.03 1984 0.14 -0.06 0.69  
MONTH TO DATE 0.08 0.39 -0.31 0.87  
SINCE MAR 1 4.63 7.24 -2.61 8.42  
SINCE JAN 1 10.79 12.66 -1.87 14.99  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0 0.0  
SINCE MAR 1 T 3.1 -3.1 T  
SINCE JUL 1 12.0 22.0 -10.0 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 7 -7 0  
MONTH TO DATE 7 21 -14 13  
SINCE MAR 1 822 1003 -181 843  
SINCE JUL 1 4015 4593 -578 3987  
 
COOLING  
YESTERDAY 3 1 2 4  
MONTH TO DATE 6 3 3 4  
SINCE MAR 1 32 23 9 7  
SINCE JAN 1 32 23 9 7    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION S (180)  
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION S (180)  
AVERAGE WIND SPEED 8.4  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 10:00 PM  
LOWEST 51 12:00 AM  
AVERAGE 71  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 72 90 2001  
2018  
MINIMUM TEMPERATURE (F) 47 31 1967  
 
SUNRISE AND SUNSET  
MAY 4 2021...........SUNRISE 6:08 AM EDT SUNSET 8:06 PM EDT  
MAY 5 2021...........SUNRISE 6:07 AM EDT SUNSET 8:07 PM EDT  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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